Java Reference
In-Depth Information
To see how it works, copy both of these JSPs to the
<
SERVER_ROOT
>/djs/
directory and open
your browser to the following URL:
http://
localhost
/djs/RequestBean1.jsp
You will see a page similar to Figure 17.2.
F
IGURE
17.2
The output from
RequestBean1.jsp
.
You can reload the page several times, but the result will always be the same. The second JSP
will print the current value of the
count
property as
11
. This is because the instance of the
bean only lasts as long as the request.
session
Scope
Beans with
session
scope are accessible only within pages processing requests that are in the
same session as the one in which the bean was created. It is illegal to define an object with
session
scope from within a page whose
page
directive has an attribute
session=false
.
References to the
session
objects are released after their associated sessions expire. Objects
with
session
scope are stored in the
session
object associated with the page.
Beans that use
session
scope are most often used when there is a need to share information
between requests for a single client. A common application using bean scope is a shopping
